Performance on (A) the CFPT, (B) the CFMT and (C) a famous faces test.

<p>‘CFPT’ refers to the Cambridge Face Perception Test <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0062656#pone.0062656-Duchaine1" target="_blank">[38]</a> and ‘CFMT’ to the Cambridge Face Memory Test <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0062656#pone.0062656-Duchaine2" target="_blank">[48]</a>. ‘Higher IQ’ refers to Möbius participants and aged-matched controls with IQs within the higher range; ‘Older Low-IQ’ refers to the control group matched to MB2 according to age, IQ and gender; and ‘Younger Low-IQ’ refers to the control group matched to MB5 on the same measures.